<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>leishuzu</title>
</head>
<body>
  <div class="aaa">111</div>
  <div class="aaa">222</div>
  <div class="aaa">333</div>
</body>
<script>
/**
 * 类数组 
 */
const arr = document.querySelectorAll('.aaa')
// const _arr = Array.prototype.slice.call(arr, 0)
const _arr = Array.from(arr)
console.log(_arr)
function testArr() {
  console.log(Array.from(arguments))
}
console.log(testArr(1,2,4))
function test(a, b,c) {
  console.log(a,b,c)
  console.log(this + a+b+c)
}
const _test = test.bind(2, 10)
_test(2,4)
</script>
</html>